为什么类不在gmaven-plugin脚本的classpath中？

Question

这是我的pom.xml

<project>
  [...]
  <build>
    <plugins>
      <plugin>
        <groupId>org.codehaus.gmaven</groupId>
        <artifactId>gmaven-plugin</artifactId>
        <version>1.3</version>
        <executions>
          <execution>
            <phase>generate-test-resources</phase>
            <goals>
              <goal>execute</goal>
            </goals>
            <configuration>
              <classpath>
                <element>
                  <groupId>hsqldb</groupId>
                  <artifactId>hsqldb</artifactId>
                  <version>1.8.0.10</version>
                </element>
              </classpath>
              <source>
                Class.forName("org.hsqldb.jdbcDriver")
              </source>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>

输出：

$ mvn test
[INFO] Scanning for projects...
...
[INFO] --- gmaven-plugin:1.3:execute (default) @ foo ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 5.866s
[INFO] Finished at: Sun May 08 17:53:13 PDT 2011
[INFO] Final Memory: 7M/1531M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.gmaven:gmaven-plugin:1.3:execute 
(default) on project foo: java.lang.ClassNotFoundException: 
org.hsqldb.jdbcDriver -> [Help 1]
...

为什么这个类不在类路径中？

Answer 1

多亏了this post，我找到了解决问题的方法：

import org.hsqldb.jdbcDriver
def driver = new jdbcDriver()

我不明白为什么它不能通过类加载器工作...